Stevens, D.S.PBurns, P.A.C.200206Surficial-geologic map of the Eagle A-1 Quadrangle, Fortymile mining districtvector digital data, mapPreliminary Interpretive ReportPIR 2002-1CFairbanks, AK, USAState of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys1 sheet, 1:63,360 scalehttp://dx.doi.org/10.14509/22081The Alaska Division of Geological & Geophysical Surveys (DGGS) has conducted 1:63,360-scale geologic mapping of the Eagle A-1 Quadrangle.The area is part of the 100-year old Fortymile mining district and is located in eastern Alaska near the Alaska-Yukon border. This map illustrates the distribution of a variety of unconsolidated deposits and undifferentiated bedrock in the Eagle A-1 Quadrangle, Fortymile mining district. It was prepared by the interpretation of 1:63,360-scale, false-color, infrared aerial photographs taken from July 1978 through August 1981 and is locally verified by ground observations during field visits.The results should be considered reconnaissance in nature. The dominant unconsolidated deposit is colluvium, which mantles most surfaces other than the tops of ridges and those areas immediately adjacent to streams. Three levels of stream terrace can be traced along major drainages at elevations of roughly 200, 100, and 30 meters above modern streams. A fourth low terrace is limited to the southwest part of the map area. Pleistocene mammalian remains have been recovered from ice-rich organic silt and muck overlying placer gravels in many valleys.The purpose of the project was to produce a series of 1:63,360-scale geologic maps for a portion of the Fortymile mining district. The geologic data is important for characterizing and distinguishing between geologic units.Previously published 1:63,360-scale geologic maps of this area have been reconnaissance-level maps or only covered portions of the quadrangle.Mapping at 1:63,360 scale or greater detail is needed to identify critical geologic features that may relate to more regional geologic units. The Fortymile project is part of DGGS's Airborne Geophysical and Geological Mineral Inventory Program (AGGMI), a special multi-year investment by the State of Alaska to produce framework geologic maps that will expand the knowledge base of Alaska's geologic and mineral resources, catalyze future private-sector mineral exploration and development, and guide government agencies' planning.The layers listed below are present as ArcGIS shape files. Attribute information for the following layers (entities) is included in this metadata file under the "Entity_and_Attribute_Information" section. Basic unit information is also included in the geologic unit code set file "PIR2002-1C_codeset.csv". There are two layers. Each layer is listed and described in detail under its own heading starting "Entity_Type_Label." Layers include:
>eaga1srfgeo2 polygons of surficial-geologic map units
>eaga1srfcont lines showing contacts of surficial-geologic map units
>eaga1pingo points showing locations of pingos
>eaga1border outline shape of the study area
19992002publication dateCompleteNone planned-141.504512-141.00000064.25085363.999139ISO 19115 Topic CategorygeoscientificInformationNoneGeologyMiningSTATEMAP projectUnconsolidated DepositsAlluvial DepositsColluvial DepositsGlacial DepositsComplex DepositsMan-made DepositsTerraceTailingsMammoth FossilsHorse FossilsCaribou FossilsSheep FossilsBison FossilsNoneAlaska, State OfFortymile Mining DistrictEagle QuadrangleBoundaryJack Wade JunctionTaylor HighwayTop of the World HighwayFortymile RiverSteele Creek DomeWalker ForkNoneHolocenePleistoceneQuaternaryTertiaryCenozoicCretaceousMesozoicJurassicTriassicPaleozoicPermianPennsylvanianMississippianDevonianPrecambrianThis report, map, and/or dataset are available directly from the State of Alaska, Department of Natural Resources, Division of Geological &Geophysical Surveys (see contact information below).Any hard copies or published datasets utilizing these datasets shall clearly indicate their source. If the user has modified the data in any way, the user is obligated to describe the types of modifications the user has made. User specifically agrees not to misrepresent these datasets, nor to imply that changes made by the user were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys.State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveysgeologist in the Minerals Section at DGGSmailing and physical3354 College RoadFairbanksAK99709-3707USA907-451-5010None available at this address; messages can be relayed to our office through the TDD/TTY telephone at the Department of Natural Resources building down the street (907-451-2770).907-451-5050dggspubs@alaska.gov8 am to 4:30 pm, Monday through Friday, except State holidaysPlease view our web site (http://www.dggs.alaska.gov) for the latest information on available data. Please contact us using the e-mail address provided above when possible.The geologic work was funded by the Alaska State Legislature through a Capital Improvement Project (Alaska Airborne Geophysical/Geological Mineral Inventory Program) and the general fund and through the U.S. Geological Survey STATEMAP program under U.S. Department of the Interior, U.S. Geological Survey, National Cooperative Geologic Mapping Program assistance award 01HQAG0054. The views and conclusions contained in this document are those of the authors and should not be interpreted as necessarily representing the official policies, either expressed or implied, of the U.S. Government. DGGS student interns and volunteers providing field assistance include Bryan A. Finseth (1999), Mark Mccrary (1999), J.C.Grady (2000), W.C. Munley (2000), and M.R. Johnson (2001).Milton A. Wiltse provided technical review of the maps. Jessica Mayer provided assistance with surficial geologic studies.SunOS 5.6 sun4m sparc Arc/Info version 7.0.4, shapefiles were created in ArcGIS 9Szumigala, D.J.Newberry, R.JWerdon, M.B.Athey, J.E.Stevens, D.S.P.Flynn, R.L.Clautice, K.H.Craw, P.A.200206Geologic map of the Eagle A-1 Quadrangle, Fortymile mining district, Alaskatabular digital data, vector digital data, mapPreliminary Interpretive ReportPIR 2002-1aFairbanks, AKState of Alaska, Department of Natural Resources, Division of Geological & Geophysical SurveysSzumigala, D.J.Newberry, R.J.Werdon, M.B.Athey, J.E.Flynn, R.LClautice, K.H.200206Bedrock geologic map of the Eagle A-1 Quadrangle, Fortymile mining district, Alaskatabular digital data, vector digital data, mapPreliminary Interpretive ReportPIR 2002-1bFairbanks, AK, USAState of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys1 sheet, 1:63,360 scaleWerdon, M.B.Newberry, R.J.Szumigala, D.J.Pinney, D.S.2001Geologic map of the Eagle A-2 Quadrangle, Fortymile mining district, Alaskatabular digital data, vector digital data, mapPreliminary Interpretive ReportPIR 2001-3aFairbanks, AK, USAState of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys1 sheet, scale 1:63,360Werdon, M.B.Newberry, R.J.Szumigala, D.J.2001Bedrock geologic map of the Eagle A-2 Quadrangle, Fortymile mining district, Alaskatabular digital data, vector dgital data, mapPreliminary Interpretive ReportPIR 2001-3bFairbanks, AK, USAState of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys1 sheet, scale 1:63,360Pinney, D.S.2001Surficial-geologic map of the Eagle A-2 Quadrangle, Fortymile mining district, Alaskavector digital data, mapPreliminary Interpretive ReportPIR 2001-3cFairbanks, AK, USAState of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys1 sheet, scale 1:63,360Pinney, D.S.2001Engineering-geologic map of the Eagle A-2 Quadrangle, Fortymile mining district, Alaskatabular digital data, vector digital dta, mapPreliminary Interpretive ReportPIR 2001-3dFairbanks, AK, USAState of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys1 sheet, scale 1:63,360Szumigala, D.J.Newberry, R.J.Werdon, M.B.Finseth, B.A.Pinney, D.S.Flynn, R.L.2000Major-oxide, minor-oxide, trace-element, and geochemical data from rocks collected in a portion of the Fortymile mining district, Alaska, 1999tabular digital data, vector digitaldata, mapRaw Data FileRDF 2000-1Fairbanks, AK, USAState of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys26 p., 2 sheets, scale 1:63,360Werdon, M.B.Szumigala, D.J.Newberry, R.J.Grady, J.C.Munly, W.C.2000Major-oxide, minor-oxide, trace-element, rare-earth element and geochemical data from rocks collected in Eagle and Tanacross quadrangles, Alaska in 2000tabular digital data, vector digital data, mapRaw Data FileRDF 2000-4Fairbanks, AK, USAState of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys27 pages, 3 sheets, 1:63,360 scaleSzumigala, D.J.Werdon, M.B.Newberry, R.J.Athey, J.E.Clautice, K.H.Flynn, R.L.Grady, J.C.Munly, W.C.Johnson, M.R.200206Major-oxide, minor-oxide, trace-element, rare-earth element, trace geochemical, and coal quality data from rocks collected in Eagle and Tanacross quadrangles, Alaska in 1999, 2000, and 2001tabular digital data, vector dgital data, mapRaw Data FileRDF 2002-1Fairbanks, AK, USAState of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys33 pages, 1 sheet, 1:63,360 scaleBurns, L.E.DighemStevens Exploration Management Corp.1999CD-ROM containing profile and gridded data and section lines of 1998 geophysical survey data for part of the Fortymile mining district, Alaska, southern Eagle and northern Tanacross quadranglestabular digital data, raster digital data, vector digital dataPublic-Data FilePDF 99-9Fairbanks, AK, USAState of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys2 CD-ROMsPritchard, R.A.Dighem1999Project report of the 1998 geophysical survey data for part of the Fortymile mining district, Alaska, southern Eagle and northern Tanacross quadranglesreportPublic-Data FilePDF 99-7Fairbanks, AK, USAState of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys162 p., 2 sheets, scale 1:63,360Burns, L.E.Liss, Shirley1999Portfolio of aeromagnetic and resistivity maps of part of the Fortymile mining area, AlaskareportPublic-Data FilePDF 99-6Fairbanks, AK, USAState of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys20 p., 1 sheet.Certainty in identification of the map units varies due to the scale and interpretive nature of the mapping. The geologic unit interpretations and boundaries presented in this report result from investigative traverses throughout the map area as well as examination of roadcuts and river exposures. Surficial-geologic polygons and lines were edited and attributed using Arc, Info, and ArcEdit. Bedrock point data of locations of structural observations (strike, dip, cleavage, jointing, etc.) and "rubblecrop" were intersected with the surficial-geologic polygon coverage using the Arc command "intersect" in order to identify locations that were mapped as surficial materials based on aerial photography but were found to have small exposures that were desireable to be mapped as bedrock. These areas were then modified in the surficial-geologic coverages to be areas of bedrock exposure. See process steps for more information about the mapping and GIS methodology. This report has received two technical reviews by scientists familiar with the subject matter. We incorporated the reviewer's suggestions into the final draft when deemed appropriate.Polygon topology is present and clean on the original geospatial dataset. All polygon features were topologically validated using ArcInfo software prior to export to shapefile format.The data set utilizes field observations and air photo interpretations to locate and characterize the geologic unit extent and features. It includes geospatial information about units traceable on air photos at a scale of ~1:65000 and/or in the field. Potential radiocarbon and tephra samples were collected in the field area but not analyzed.Surficial-geologic map data has a horizontal positional accuracy dependent on: 1) the 1:50,000-scale (nominal) aerial photographs on which it is based, with an estimated potential error due to a pen line width of approximately 0.001 being equivalent to approximately 1.5 meters on the ground; 2) the accuracy of the human zoom transfer scope operator in tracing the linework from acetate overlays to topographic base maps, with an estimated error due to a pen line width of approximately 0.001 being equivalent to approximately 1.5 meters on the ground; 3) the accuracy of the zoom transfer process itself, error magnitude highly variable and unknown but potentially large; 4) the digitizing RMS error of 0.003 inches (input coverage units), which equates to approximately 5 meters on the ground for a 1:63,360-scale map; and 5) the accuracy of the human operator digitizing the geologic linework from the topographic base maps, with an estimated error due to a pen line width of approximately 0.001 being equivalent to approximately 1.5 meters on the ground. Total potential horizontal error for surficial-geologic map features is therefore estimated to be approximately 15 meters.Yeend, Warren1996Gold placers of the historical Fortymile River region, AlaskadocumentU.S. Geological Survey BulletinB 2125Washington D.C.United States Government Printing Office74 p., 1 sheet
paper1996ground conditionYeend, 1996Geologic map compilationWeber, F.R.1986Glacial geology of the Yukon-Tanana Uplandbook chapterAnchorage, AKAlaska Geological Society20 p. 79-98Hamilton, T. D.Reed, Katherine M.Thorson, R.M.1986Glaciation in Alaska - Tthe geologic recorddocumentAnchorage, AK, United StatesAlaska Geological Society265 p.paper1986ground conditionWeber, 1986Geologic map compilationFieldwork - Fieldwork for surficial investigations, including traverses, roadcut investigations, and river exposures, was conducted for 60 person-days during the months of June through August in 1999 - 2001. Field notes and sediment samples were collected throughout the quadrangle for surficial investigations. Surficial mapping involved using Yeend (1996) on a regular basis for checking placer geology and general units. Surficial mappers recorded observations on co-registered acetate overlays on 1:50,000-scale (nominal) color-infrared aerial photographs, and directly on 1:63,360-scale topographic base maps. Stations were located using air photos and handheld GPS devices with location precision varying from ±3 to 15 meters.Yeend, 1996Weber, 19862001Geologic map compilation - Surficial-geologic information was interpreted using 1:50,000-scale (nominal) air-photo stereopairs, and compiled onto acetate overlays. The overlay information was transferred to a paper 1:63,360-scale USGS topographic base using a zoom transfer scope.2002Surficial-geologic information was digitized from the paper USGS topographic base map (above) into Arc/Info 7.0.4 GIS (ArcEdit module) using a large-format digitizing table. Surficial-geologic polygons and lines were then edited and attributed using Arc, Info, and ArcEdit. Bedrock point data (see DGGS PIR 2002-1B) of locations of structural observations (strike, dip, cleavage, jointing, etc.) and "rubblecrop" were intersected with the surficial-geologic polygon coverage using the Arc command "intersect" in order to identify locations that were mapped as surficial materials based on aerial photography but were found to have small exposures that were desireable to be mapped as bedrock.These areas were then modified in the surficial-geologic coverages to be areas of bedrock exposure. Final bedrock and surficial geology polygon coverages were merged using the Arc command "union" to generate the polygon coverage used to make PIR 2002-1a, the comprehensive geologic map.2002Metadata creation - metadata for this report was compiled by Patricia Gallagher, Simone Montayne, and De Anne Stevens2010VectorComplete chain4134GT-polygon composed of chains1504Universal Transverse Mercator70.9996-141.00005000000coordinate pair0.0002540.000254meterseaga1srfgeo2Universal Transverse Mercator70.9996-141.00005000000coordinate pair0.0002540.000254meterseaga1srfcontUniversal Transverse Mercator70.9996-141.00005000000coordinate pair0.0002540.000254meterseaga1pingoUniversal Transverse Mercator70.9996-141.00005000000coordinate pair0.0002540.000254meterseaga1borderNorth American Datum of 1927Clarke 18666378206.4294.978698eaga1srfgeo2eaga1srfgeo2.shpPolygons of surficial-geologic map units.This report.UNITGeologic unitDGGSPIR2002-1c_codeset.csvAlaska Division of Geological & Geophysical Surveyseaga1srfconteaga1srfcont.shpLines showing contacts of surficial-geologic map units.This report.JUSTBEDGeologic UnitDGGSPIR2002-1C_codeset.csvAlaska Division of Geological & Geophysical Surveyseaga1pingoeaga1pingo.shpPoints showing locations of pingos.This report.EAGA1PINGOnumber assigned to each pingothis reportpopulated with values 1 and 2, this is an arbritrary number assigned to each pingo localityeaga1bordereaga1border.shpOutline shape of the study area.This report.State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveysmailing and physical3354 College RoadFairbanksAK99709-3707USA907-451-5020907-451-5050dggspubs@alaska.gov8 am to 4:30 pm, Monday through Friday, except State holidaysPlease view our web site (http://www.dggs.alaska.gov) for the latest information on available data. Please contact us using the e-mail address provided above when possible.The State of Alaska makes no express or implied warranties (including warranties of merchantability and fitness) with respect to the character, function, or capabilities of the electronic services or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products, any failure thereof, or otherwise, and in no event will the State of Alaska's liability to the requester or anyone else exceed the fee paid for the electronic service or product.Current publication is available on paper. To purchase this or other printed reports and maps, contact DGGS by phone (907-451-5020), e-mail (dggspubs@alaska.gov), or fax (907-451-5050). Payment accepted: Cash, check, money order, VISA, or MasterCard.for payment instructions see http://dx.doi.org/10.14509/22081SHPNo compression appliedhttp://dx.doi.org/10.14509/22081Free downloadPDFNo compression appliedhttp://dx.doi.org/10.14509/22081Free downloadDGGS publications are available as free online downloads or you may purchase paper hard-copies or digital files on CD/DVD or other digital storage media over the counter by mail, phone, fax, or email from the DGGS Fairbanks office.Turn around time is 1-2 weeks unless special arrangements are made and an express fee is paid. Shipping charge will be the actual cost of postage and will be added to the total amount due. Contact us for a exact shipping ammount.20101004Metadata managermailing and physicalState of Alaska, Department of Natural Resources, Division of Geological & Geophysical SurveysFairbanksAK99709-3707USA907-451-5020FGDC Content Standard for Digital Geospatial MetadataFGDC-STD-001-1998If the user has modified this metadata file in any way, the user is obligated to describe the types of modifications the user has made. User specifically agrees not to misrepresent this metadata file, nor to imply that changes made by the user were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys.http://www.dggs.alaska.gov/metadata/dggs.extdggs metadata extensions